Gosudar ostinato rigore
How do you know, and how can you check, that what you are reading is good Esperanto? The best sources about correct Esperanto usage are written in Esperanto (or in Russian!). On a lernu forum I was given a list of good sources of information. I re-post them here so that I can easily find them again when my level of Esperanto has advanced to a point where I can make proper use of them.